Yeti working or not, doesn't affect ticket sales. Why fix it? (current management's thought process).
The current management has made it so bad that Disney literally doing anything to their parks (any sort of improvement) is met with awe and a, "It doesn't matter if it doesn't fit... It's an improvement! What are you complaining about???" You can see that with nearly any recent thing that has opened, will be opening, or changed. They could put another Frozen ride where Stitch is (was) in Tomorrowland and people would laud it as finally Tomorrowland is getting some love/improvements. People would line up for it out of curiosity and everyone would pat themselves on the back about how right it was to put Frozen in Tomorrowland (because at least it's something).
I hate to say it, but they (management) are right. You can starve your customers of what they want and then if you produce something/anything people will clamor for it.
Think about The Force Awakens. It wasn't a particularly good movie. The problem is that it had been so long since a good Star Wars movie (1980s) AND I, II, & III sucked so much that literally anything that didn't suck as bad as I, II, or III would be thought of as great. I thought the same thing when I walked out of the theater until, a bit later, it dawned on me, "...it really wasn't that good. It just didn't suck like the rest." It's a pretty low bar to set: It doesn't suck / continue to suck.